I call BS on the part in bold.
Of course coaches tell players what they want to hear in recruiting and try to spin things in a way that is going to make the player want to commit. But any coaches flat out lying to recruits is just asking for trouble once the kid gets there.
Any recruit that truly believes anything is promised to them when they commit is fooling themselves and in this day and age being super naive. Not like this is anything new.
One of my all time favorite movies is The Program from 1993. Omar Epps comes on a recruiting visit and they meet him with the band, cheerleaders, all kinds of crap. Then he shows up for the start of camp, just a couple players meet him coming off the bus. He asks about the lack of fanfare and the other players make some comment to the effect that we've got you now so all that other stuff goes away.